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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<h1 align=center>QBitArray Class Reference</h1><br clear="all">
<p>
The QBitArray class provides an array of bits.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qbitarray-h.html">qbitarray.h</a>></code>
<p>
Inherits <a href="qbytearray.html">QByteArray</a>.
<p><a href="qbitarray-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn"><a href="#e533fe"><b>QBitArray</b></a>()</div>
<li><div class="fn"><a href="#823ee1"><b>QBitArray</b></a>(uintsize)</div>
<li><div class="fn"><a href="#fe832a"><b>QBitArray</b></a>(constQBitArray&a)</div>
<li><div class="fn">QBitArray&<a href="#5e1a4d"><b>operator=</b></a>(constQBitArray&)</div>
<li><div class="fn">uint<a href="#cb21b3"><b>size</b></a>()const</div>
<li><div class="fn">bool<a href="#cd56bd"><b>resize</b></a>(uintsize)</div>
<li><div class="fn">bool<a href="#3c8d5b"><b>fill</b></a>(boolv, intsize=-1)</div>
<li><div class="fn">virtualvoid<a href="#54f3d7"><b>detach</b></a>()</div>
<li><div class="fn">QBitArray<a href="#074e11"><b>copy</b></a>()const</div>
<li><div class="fn">bool<a href="#fbcada"><b>testBit</b></a>(uintindex)const</div>
<li><div class="fn">void<a href="#2775cb"><b>setBit</b></a>(uintindex)</div>
<li><div class="fn">void<a href="#faf6b7"><b>setBit</b></a>(uintindex, boolvalue)</div>
<li><div class="fn">void<a href="#809f09"><b>clearBit</b></a>(uintindex)</div>
<li><div class="fn">bool<a href="#d40857"><b>toggleBit</b></a>(uintindex)</div>
<li><div class="fn">bool<a href="#7d94e3"><b>at</b></a>(uintindex)const</div>
<li><div class="fn">QBitVal<a href="#988b5d"><b>operator[]</b></a>(intindex)</div>
<li><div class="fn">bool<a href="#1821b0"><b>operator[]</b></a>(intindex)const</div>
<li><div class="fn">QBitArray&<a href="#142428"><b>operator&=</b></a>(constQBitArray&)</div>
<li><div class="fn">QBitArray&<a href="#b9e8fa"><b>operator|=</b></a>(constQBitArray&)</div>
<li><div class="fn">QBitArray&<a href="#3e519c"><b>operator^=</b></a>(constQBitArray&)</div>
<li><div class="fn">QBitArray<a href="#05abdf"><b>operator~</b></a>()const</div>
</ul>
<h2>Protected Members</h2>
<ul>
<li><div class="fn">array_data*<b>newData</b>()</div>
<li><div class="fn">virtualvoid<a href="#cfc164"><b>deleteData</b></a>(array_data*d)</div>
</ul>
<h2>Related Functions</h2>
(Note that these are not member functions.)
<ul>
<li>QBitArray <a href="qbitarray.html#11dcc0"><b>operator^</b></a> (const QBitArray & a1, const QBitArray & a2)
<li>QBitArray <a href="qbitarray.html#3b8a87"><b>operator&</b></a> (const QBitArray & a1, const QBitArray & a2)
<li>QDataStream & <a href="qbitarray.html#cbf466"><b>operator<<</b></a> (QDataStream & s, const QBitArray & a)
<li>QBitArray <a href="qbitarray.html#cdfb18"><b>operator|</b></a> (const QBitArray & a1, const QBitArray & a2)
<li>QDataStream & <a href="qbitarray.html#d17d77"><b>operator>></b></a> (QDataStream & s, QBitArray & a)
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QBitArray class provides an array of bits.
<p>
<a href="qstring.html">QString</a> inherits <a href="qbytearray.html">QByteArray</a>, which is defined as <a href="qarray.html">QArray</a><char>.
<p>Since QBitArray is a QArray, it uses explicit
<a href="shclass.html">sharing</a> with a reference count.
<p>A QBitArray is a special byte array that can access individual bits and
perform bit-operations (AND, OR, XOR and NOT) on entire arrays or bits.
<p>Bits can be manipulated by the <a href="#2775cb">setBit</a>() and <a href="#809f09">clearBit</a>() functions, but it
is also possible to use the indexing [] operator to test and set
individual bits. The [] operator is a little slower than the others,
because some tricks are required to implement single-bit assignments.
<p>Example:
<pre> <a href="qbitarray.html">QBitArray</a> a(3);
a.<a href="#2775cb">setBit</a>( 0 );
a.<a href="#809f09">clearBit</a>( 1 );
a.<a href="#2775cb">setBit</a>( 2 ); // a = [1 0 1]
<a href="qbitarray.html">QBitArray</a> b(3);
b[0] = 1;
b[1] = 1;
b[2] = 0; // b = [1 1 0]
<a href="qbitarray.html">QBitArray</a> c;
c = ~a & b; // c = [0 1 0]
</pre>
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="e533fe"></a>QBitArray::QBitArray()</h3>
<p>Constructs an empty bit array.
<h3 class="fn"><a name="fe832a"></a>QBitArray::QBitArray(constQBitArray&a)</h3>
<p>Constructs a shallow copy of <em>a.</em>
<h3 class="fn"><a name="823ee1"></a>QBitArray::QBitArray(uintsize)</h3>
<p>Constructs a bit array of <em>size</em> bits. The bits are uninitialized.
<h3 class="fn">bool<a name="7d94e3"></a>QBitArray::at(uintindex)const</h3>
<p>Returns the value (0 or 1) of the bit at position <em>index.</em>
<p>See also <a href="#1821b0">operator[]</a>().
<h3 class="fn">void<a name="809f09"></a>QBitArray::clearBit(uintindex)</h3>
<p>Clears the bit at position <em>index</em> (sets it to 0).
<p>See also <a href="#2775cb">setBit</a>() and <a href="#d40857">toggleBit</a>().
<h3 class="fn">QBitArray<a name="074e11"></a>QBitArray::copy()const</h3>
<p>Returns a deep copy of the bit array.
<p>See also <a href="#54f3d7">detach</a>().
<h3 class="fn">void<a name="cfc164"></a>QBitArray::deleteData(<a href="qbitarray.html#array_data">array_data</a>*d) <code>[virtualprotected]</code></h3>
<p>Deletes data specific to QBitArray that extended what <a href="qgarray.html">QGArray</a> provided.
<p>Reimplemented from <a href="qgarray.html#c19613">QGArray.</a>
<h3 class="fn">void<a name="54f3d7"></a>QBitArray::detach() <code>[virtual]</code></h3>
<p>Detaches from shared bit array data and makes sure that this bit array
is the only one referring the data.
<p>If multiple bit arrays share common data, this bit array dereferences the
data and gets a copy of the data. Nothing will be done if there is just
a single reference.
<p>See also <a href="#074e11">copy</a>().
<p>Reimplemented from <a href="qgarray.html#9b33f3">QGArray.</a>
<h3 class="fn">bool<a name="3c8d5b"></a>QBitArray::fill(boolv, intsize=-1)</h3>
<p>Fills the bit array with <em>v</em> (1's if <em>v</em> is TRUE, or 0's if <em>v</em> is FALSE).
<p>Will resize the bit array to <em>size</em> bits if <em>size</em> is nonnegative.
<p>Returns FALSE if a nonnegative <em>size</em> was specified and if the bit array
could not be resized, otherwise returns TRUE.
<p>See also <a href="#cd56bd">resize</a>().
<h3 class="fn">QBitArray&<a name="142428"></a>QBitArray::operator&=(constQBitArray&a)</h3>
<p>Performs the AND operation between all bits in this bit array and <em>a.</em>
Returns a reference to this bit array.
<p>The result has the length of the longest bit array of the two, with the bits
missing from the shortest array taken as 0.
<p>Example:
<pre> <a href="qbitarray.html">QBitArray</a> a( 3 ), b( 2 );
a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
b[0] = 1; b[1] = 0; // b = [1 0]
a &= b; // a = [1 0 0]
</pre>
<p>See also <a href="#b9e8fa">operator|=</a>(), <a href="#3e519c">operator^=</a>() and <a href="#05abdf">operator~</a>().
<h3 class="fn">QBitArray&<a name="5e1a4d"></a>QBitArray::operator=(constQBitArray&a)</h3>
<p>Assigns a shallow copy of <em>a</em> to this bit array and returns a reference
to this array.
<h3 class="fn"><a href="qbitval.html">QBitVal</a><a name="988b5d"></a>QBitArray::operator[](intindex)</h3>
<p>Implements the [] operator for bit arrays.
<p>The returned <a href="qbitval.html">QBitVal</a> is a context object. It makes it possible to get
and set a single bit value.
<p>Example:
<pre> <a href="qbitarray.html">QBitArray</a> a( 3 );
a[0] = 0;
a[1] = 1;
a[2] = a[0] ^ a[1];
</pre>
<p>The functions <a href="#fbcada">testBit</a>(), <a href="#2775cb">setBit</a>() and <a href="#809f09">clearBit</a>() are faster.
<p>See also <a href="#7d94e3">at</a>().
<h3 class="fn">bool<a name="1821b0"></a>QBitArray::operator[](intindex)const</h3>
<p>Implements the [] operator for constant bit arrays.
<h3 class="fn">QBitArray&<a name="3e519c"></a>QBitArray::operator^=(constQBitArray&a)</h3>
<p>Performs the XOR operation between all bits in this bit array and <em>a.</em>
Returns a reference to this bit array.
<p>The result has the length of the longest bit array of the two, with the bits
missing from the shortest array taken as 0.
<p>Example:
<pre> <a href="qbitarray.html">QBitArray</a> a( 3 ), b( 2 );
a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
b[0] = 1; b[1] = 0; // b = [1 0]
a ^= b; // a = [0 0 1]
</pre>
<p>See also <a href="#142428">operator&=</a>(), <a href="#b9e8fa">operator|=</a>() and <a href="#05abdf">operator~</a>().
<h3 class="fn">QBitArray&<a name="b9e8fa"></a>QBitArray::operator|=(constQBitArray&a)</h3>
<p>Performs the OR operation between all bits in this bit array and <em>a.</em>
Returns a reference to this bit array.
<p>The result has the length of the longest bit array of the two, with the bits
missing from the shortest array taken as 0.
<p>Example:
<pre> <a href="qbitarray.html">QBitArray</a> a( 3 ), b( 2 );
a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
b[0] = 1; b[1] = 0; // b = [1 0]
a |= b; // a = [1 0 1]
</pre>
<p>See also <a href="#142428">operator&=</a>(), <a href="#3e519c">operator^=</a>() and <a href="#05abdf">operator~</a>().
<h3 class="fn">QBitArray<a name="05abdf"></a>QBitArray::operator~()const</h3>
<p>Returns a bit array which contains the inverted bits of this bit array.
<p>Example:
<pre> <a href="qbitarray.html">QBitArray</a> a( 3 ), b;
a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
b = ~a; // b = [0 1 0]
</pre>
<h3 class="fn">bool<a name="cd56bd"></a>QBitArray::resize(uintsize)</h3>
<p>Resizes the bit array to <em>size</em> bits.
Returns TRUE if the bit array could be resized.
<p>When expanding the bit array, the new bits will be uninitialized.
<p>See also <a href="#cb21b3">size</a>().
<h3 class="fn">void<a name="2775cb"></a>QBitArray::setBit(uintindex)</h3>
<p>Sets the bit at position <em>index</em> (sets it to 1).
<p>See also <a href="#809f09">clearBit</a>() and <a href="#d40857">toggleBit</a>().
<h3 class="fn">void<a name="faf6b7"></a>QBitArray::setBit(uintindex, boolvalue)</h3>
<p>Sets the bit at position <em>index</em> to <em>value.</em>
<p>Equivalent to:
<pre> if ( value )
setBit( index );
else
clearBit( index );
</pre>
<p>See also <a href="#809f09">clearBit</a>() and <a href="#d40857">toggleBit</a>().
<h3 class="fn">uint<a name="cb21b3"></a>QBitArray::size()const</h3>
<p>Returns the size (number of bits) of the bit array.
<p>See also <a href="#cd56bd">resize</a>().
<h3 class="fn">bool<a name="fbcada"></a>QBitArray::testBit(uintindex)const</h3>
<p>Returns TRUE if the bit at position <em>index</em> is set.
<p>See also <a href="#2775cb">setBit</a>() and <a href="#809f09">clearBit</a>().
<h3 class="fn">bool<a name="d40857"></a>QBitArray::toggleBit(uintindex)</h3>
<p>Toggles the bit at position <em>index.</em>
<p>If the previous value was 0, the new value will be 1. If the previous
value was 1, the new value will be 0.
<p>See also <a href="#2775cb">setBit</a>() and <a href="#809f09">clearBit</a>().
<hr><h2>Related Functions</h2>
<h3>QBitArray <a name="11dcc0"></a>operator^ (const QBitArray & a1, const QBitArray & a2)</h3>
<p>Returns the XOR result between the bit arrays <em>a1</em> and <em>a2.</em>
<p>See also QBitArray::operator^().
<h3>QBitArray <a name="3b8a87"></a>operator& (const QBitArray & a1, const QBitArray & a2)</h3>
<p>Returns the AND result between the bit arrays <em>a1</em> and <em>a2.</em>
<p>See also QBitArray::operator&=().
<h3><a href="qdatastream.html">QDataStream</a> & <a name="cbf466"></a>operator<< (<a href="qdatastream.html">QDataStream</a> & s, const QBitArray & a)</h3>
<p>Writes a bit array to a stream.
<p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>
<h3>QBitArray <a name="cdfb18"></a>operator| (const QBitArray & a1, const QBitArray & a2)</h3>
<p>Returns the OR result between the bit arrays <em>a1</em> and <em>a2.</em>
<p>See also QBitArray::operator|=().
<h3><a href="qdatastream.html">QDataStream</a> & <a name="d17d77"></a>operator>> (<a href="qdatastream.html">QDataStream</a> & s, QBitArray & a)</h3>
<p>Reads a bit array from a stream.
<p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>
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